Dipper tooth



Patented Jan. 6, 1931 UNIrsD STAT-ss 'Param/ o'l-FICE' WALTER. sjM'CKEE, on onroaeo, rnninors, sesto-Nonno KENSINGTON STEELv oom- -f PANY, or ci-ironeo, immers, Aooaroan'rron or rLLrNoIsi .Dirrnn Toorn` Application filed october 4,

My invention relates to Adipper teeth ,for

excavating` buckets and the like and has par- 10 ends of the nose, to hold the point rigidly in position on kthe nose at ralltinoes, Vandv to re.- lieve the attaching bolt from strain during dge'ns- The nose of the base of this invention is bifurcated while the rearwardly extending jaws of the point are connected by a vertically,v disposed web. which extends substantially the whole length of the j aws. A recess is formed .in the point'forwardly of the front edge of the web and between integral portions or sides of the point for the reception of the front end of the nose.r This recess is open in but one direction, i.l e., rearwardly. The ends of the base nose enter this recess when the parts are assembled in operative relation. A wedge boltis passed through suitably disposed openings in the sides of the nose and the web of the point for retaining the point in place. f

An object-of the invention is to provide ay clipper tooth construction wherein the point is rigidly held in operative position .on a bifuroated base in such manner as to prevent spreading of the nose of the base by means Another object ofthe invention is to provide a dipper tooth construction including a base and a removable point wherein the bifurcated nose of the base is prevented from spreading by means other than the'attaching olt employed to connect the point tothe ase.

A further object of the invention is to provide a construction of a dipper tooth wherein the base portion has a bifurcated nose with a removable point, the point being held against lateral motion by a web extending between the jaws of said point and received within the bifurcated end of the base; wherein the bifurcated portion of the nose is preof the interlitting of the base and the point.

1927. semi NGL 223,886.

vented from spreading by side webs in the point embracing the ends of the bifurcated nose; andewh'erein wedger bolt cooperates with'the base yand point for securing said in the ends of the bifurcated noses are braced laterally by kside webs in the-point, thus relieving the attaching bolt of strain in this regard.

Another andfurther :object is to provide the base and point of atwo-part dipper tooth with cooperating ledges and shoulders for engagement during` digging Lfor relieving the attaching bolt from-the usual digging strains. fg

A yetk further objecty of the invention is to improvedipper tooth construction whereby the'bifurcated base and point may be manu-4 factured' readily so as to be well adapted to foundry practice, both as to manufacture and c-ore making and also one that is easily ground and fitted. y Y

The above recite-d and other objects will be apparent from the following specification and drawings, and will be `pt trtioularly pointed out in the appended claims.

ln the drawings: f

Figa-1 is a side elevation, showing the pre- The base of my invention as represented i' generally. by thereference character 34 is formed with spaced upper and lower jaws adapted to beengaged in ther usual manner Vwith the edge portion of an excavating dipper. rlhe .front end of the base 34: is wedgeshaped, defining a nosewhich is bifurcated by slot 17, thus formingthe two nose-portions 18 and 19. This aperture 17 is for the reception of the web in the point as will more fully hereinafter appear. The outer end por tions of the nose members 18 and 19 have shoulders *'38 defined `by cutting away or otherwise shaping the front ends of the nose .portions to `provide said shoulders and reduced ends as shown in Fig. 4 ofthe Y drawing.

n The point of my invention shown in Fig, 3 in perspective,V comprises a digging or cutting edge andrearwardly extending and diverging jaws 33a and 336. A vertically disposed web extending lengthwise of the point connects the jaws 33a and 33bfor strength ening purposes. VThis web extends fromapwhich proximately the rear ends of the jaws .forwardly terminating short of the recess or pocket 36 formed in the point. The inner surfaces-,of the jawsv 33a and 33?) converge and meet la vertically disposed surface 39 which forms. an abutment substantially at :right angles to the longitudinal axis of the point member. 'l'heweb 35 is provided with 'perpendicular andthe other surface inclined to the plane ofthe side o f the nose. Similarly the member 19 is provided with an aper ture 29 having .one perpendicular side in alignment with the perpendicular side of the aperture 29 and with its other side inclined coincident with the inclination of lthe aperture Iin the side 18. Y

The sides of the point immediately forwardly of the abutment 39,V as indicated at 31, form the ends of the pocket or recess 36 therein. Y

i* In assembling the point on the base `the web 35 is receivedinV the aperture between the members 18 and k19 of the nose with the abutments 39 of the .point against the shoulders 38 of the base. The bolt is inserted with the nut off through the larger opening in the side 18 passing through the opening 26 in the web of the point and through the opening 2 in the side member 19 of the nose. The nut 32 is then applied and tightened as desired.

-It will be noted from Fig. 2 that the rear surface defining the aperture 26'in the web 23 1s forwardly of the rear walls ofthe vopenings 29 and 30 in the nose members 18 and 19. Consequently, as the nut 32 is tightened on the bolt the point will be drawn inwardly to tightly lit the base.

It will. be observed that lateral motion of the point on the base is prevented by reason of the web 35 being included between the members 18and 19 of the nose and because Athrepoint tothe base through thev jaws 33a and 33?), the abutting surfacesl 39 and 38 and thecontacts between the meeting surfaces of the ends 37 ofthe base withk thecorrespending surfaces or ends; of the recess 36 in the point. f

The'ends 37 are curved in plan, to correspond substantially to the curvature of the inner Vwall of YtheV recess 36.

Y It willbe noted that the abutting shoulders 3'? and 33 are perpendicular to the center line of the point, that is, the line of movement in digging.y

'i It will be notedthatrwith my invention theside walls 31 ofthe point overlap the ends 37 yof the nose of the base much nearer the digging edge20 of the point than is possible with other types of construction. Y

For VArelieving thev attaching bolt from digging strains,'that is strains in' a substantially vertical directioml provide the jaw V3b 'of point 33 with substantially horizontally disposed ledges et() alongside of the web l3,5, there being similar ledges 41 on the ups,

per The ledges 40 and 41 are disposedon both sides-of the Aweb 35. For cooperating with these ledges 10 and41 of the point 331 formshoulders .112 in the nose portion of the'base. In 5 the engagement between the ledges 10 and .t1 with the shoulders 42 is shown.A It will be noted from thisdrawing that the'vertical digging strains Vtransmitted to the point 33 of the VClipper tooth are taken by engagement with these ledgesand shoulders and thus removed from the attaching bolt 43. y

It will be noted` that with` the improvements of my invention,spreading of the end 37 ofthe -nose 34 is prevented by reason of the engagement with the recessV .36 ofthe point and that the Avertical digging strains are ltaken by engagement of the shoulders andledges 107 11 and 42 and that the hori- Zontal strains imposedon the point 33xare transmitted to the nose through the web 35 engaging with the sides of the bifurcated end members of the base. In this manner all strain such as digging and those necessary `toprevent spreading are taken by the means disclosed above, tius relieving the attaching bolt from all strains except that necessarily imposed by keeping the nut thereon tight to Ymaintain the point in operative position on the base at all times.

I have found that by making the base and point in the manner above described, 'a benelit is derived therefrom in the-foundry, both as to manufacturing the parts and also as to core making. Furthermore, it is easier to grind and ft these parts together than it is in the case of bases and points constructed according tothe present practice.

IVhile I have described more 'or less` precisely the details of construction of my invention, yet I do not wish to be understood as limiting myself thereto as I contemplateV cated nose providing two nose portions, the

end of each nose portion being formed with a shoulder, said' point having diverging jaws.` and a centrally disposed pocket` forwardly of the jaws, the sides of the point forming end members for said pocket and for lateral engagement with the ends of the nose portions to prevent spreading'of the saine when in assembled position, a web connecting said jaws and adapted to enter the space between said nose portions, said point having inwardly projecting substantially parallel ledges underneath the jaws and adjacent the web, and the nose portions being recessed to receive the ledges, and ineanscooperating with said nose portions and said web for attaching saidpoint to said base;

2. A dipper tooth including a base and a removable point, said lbase having a bifurcated nose providing two nose portions, the

end of each nose portion being formed with a shoulder, said point having a solid end and diverglng jaws with a pocket in said end. forwardly of said jaws, said pocket' having a curved front wall and. flat ends,

said ends being integral parts of said point V and terminating in abutments, said pocket adapted to receive the extremities of said `nose portions with the shoulders of said nose portions against the abutments of said point, the sides of the nose portions forwardly of said shoulders bearing against the inner surfaces of said pocket ends, said point having a web between the jaws adapted to be received between the two nose portions of the base, and means for securing said point to said nose, including a wedge bolt passing through suitably disposed openings in the nose portions, and substantially parallel interengaging ledges and shoulders formed interiorly on the nose and point for accepting lateral strains.

3. A dipper tooth comprising a base and a point, said base being bifurcated to form spaced side portions, said point having a web adapted to enter the space between said side portions, said point also having a pocket forwardly of the web for receiving the ends of said side portions and engaging the sides and ends of the same, said point havingV inwardly projecting ledges underneath the jaws and besidethe Awebvthereof, the side portionsof said'base being recessed to receive the ledges thus forming shoulders for contactingwith said ledges lwhen in assembled relation, whereby strains imparted to said point are resisted bysaid engaging shoulders and ledges, the pocket in saidv point serving to prevent spreading of said side portions of the base, and a bolt for retaining said point on said base.

Y 4. A dipper tooth comprisng a base having a tapered nose, and arwedge shaped point, thefnose being vertically bifurcated to form two similar side nose portions, the

outer sides of the tapered ends of the side Y nose portions being recessed to provide forwardly facing shoulders and inner forwardly projecting tapered ends, the top and bottom diverging faces of the tapered nose being centrally. recessed rearwardly of the taperedends and shoulders to form similar recesses at either side of the bifurcation, the bottom faces of these recesses inl the'upper and lower faces of theknose being substantially parallel with one another, the larger rear end portion of the point being recessed to form upper and lower diverging jaws adapted to overlie the upper and lower faces of the nose, there being a web centrally `connecting the jaws Vand received in the bifurcation between the side portions of the nose, the forward end portion of the point being centrally recessed to receive the prol jecting tapered ends of the nose portions, the base portions of the jaws being connected by vertically extendingside walls adapted to engage the outer faces of the tapered ends of the nose and the shoulders at the base of these tapered ends, there being opposed ledge portions formed on the inner faces of the jaws and at the sides of the web and adapted tofit within the upperand lower recesses in the nose of the base, and removable means for securing the point to the base. f

WALTER S. MCKEE. 

